Gliese 876 e is an exoplanet orbiting the star Gliese 876 in the constellation of Aquarius. It is in a 1:2:4 Laplace resonance with the planets Gliese 876 c and Gliese 876 b: for each orbit of planet e, planet b completes two orbits and planet c completes four. This configuration is the second known example of a Laplace resonance after Jupiter's moons Io, Europa and Ganymede.[1] Its orbit takes 124 days to complete.

Gliese 876 e

An artist's impression of Gliese 876 e
Discovery
Discovered by	Rivera et al.
Discovery date	June 23, 2010
Detection method	Doppler spectroscopy
Orbital characteristics
Epoch HJD 2,450,602.093
Semi-major axis	0.3343 ± 0.0013 [1] AU
Eccentricity	0.055 ± 0.012 [1]
Orbital period (sidereal)	124.26 ± 0.70 [1] d
Mean anomaly	335 ± 24 [1]
Inclination	59.5 [1]
Argument of periastron	239 ± 22 [1]
Semi-amplitude	3.42 ± 0.39 [1]
Star	Gliese 876
Physical characteristics
Mass	14.6 ± 1.7 [1] MEarth

Gliese 876 e has a mass similar to that of the planet Uranus. Its orbit takes 124 days to complete, or roughly one third of a year. While the orbital period is longer than that of Mercury around the Sun, the lower mass of the host star relative to the Sun means the planet's orbit has a slightly smaller semimajor axis. Unlike Mercury, Gliese 876 e has a nearly circular orbit with an eccentricity of 0.055 ± 0.012.[1]

This planet, like b and c, has likely migrated inward.[2]

References

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[de] Gliese 876 e

[ru] Глизе 876 e